Anyway, copied from the other thread
My experience with caps:
Had 2 farads on a 1600-1800 watt system. Sounded great. I removed one; Quite noticeable reduction in output and clarity at high volumes.
Did not pay attention to voltages w/ this setup.
Had 1 farad on 1,000 watt system. don't quite remember voltages, although I payed more attention this time. Tried with/ without cap, definately noticed a reduction of bass output from the beginnoing to end of a long bass note w/o the cap. With the cap, the same note stayed at roughly the same volume.
3rd setup was a 1 farad cap on a PR1000.1 and 2 M3 12's. I paid close attention to the voltage on this setup, and noticed w/o the cap my voltage was dropping to around 10.5-10.6. Hooked up the cap, same song, and the voltage would not drop lower than 13.5.
If I had to guess, I'd say that cap was good for roughly an extra 200 watts of sustained output
NOW. This is using high quality caps (RF, Stinger).
The cheap ones do not work worth a crap.
Alot of people say they mess up your electrical, I had a stock Honda Civic alternator supplying 1800 watts on the first system I named, and even though the lights dimmed a good bit, it sounded great and my alternator held up fine.
Again, these are MY experiences.
It makes me laugh when people say caps are crap because they are making a very general statement about something that is very application specific.